TS 10th Class Physical Science – Bit Bank with Answers 2016

SET – I:
1. The refractive index of glass with respect to air is 2. Then the critical angle of glass – air interface is ……..
a) 0° b) 45° c) 30° d) 60°
2. When a light ray travels from a rarer medium (air) to a denser medium (glass) and if the angle of incidence is i and angle of refraction is r, then …….
a) i > r b) i < r c) i = r d) None of the above 3. ...... reflection does not obey the laws of reflection. a) regular b) irregular c) partial d) plane 4. The unit of refractive index is ...... a) m/s b) cm/s c) No units d) None of the above 5. Kerosene is optically ....... than water. a) diluted b) denser c) heavier d) rarer 6. The refractive index of benzene is ....... a) 0.15 b) 1.5 c) 1.33 d) 0.133 7. Optical fibres work on the principle of ....... a) reflection b) refraction c) internal reflection d) total internal reflection 8. The refractive index of air increases with.... a) hotness b) humidity c) density d) All the above 9. The incident and emergent rays in the case of glass slab are ........ a) perpendicular b) inclined c) parallel d) coincident 10. Mirage is an example of ..... a) reflection b) refraction c) optical illusion d) optical magic 11. Which one of the materials cannot be used to make a lens? a) water b) glass c) plastic d) clay 12. If f = + 0.5 m for a lens, then its power is ...... a) 0.5 dioptre b) 5 dioptre c) +2 dioptre d) + 1 dioptre 13. We can see ....... image with our eyes. a) virtual b) real c) inverted d) magnified 14. In the case of a concave lens, the image is always formed at ....... a) F b) between F and C c) beyond C d) between P and F 15. A stick held obliquely in water appears bent and short. This is due to the phenomenon of ...... a) reflection b) refraction c) scattering d) dispersion 16. A piece of transparent optical material, having one or two spherical surfaces is called ..... a) prism b) slab c) lens d) None of the above 17. The focal length of a lens depends upon ...... a) size of the object b) surrounding medium c) distance of the object d) nature of the object 18. Rays passing through the focus of a convex lens will take a path ....... to the principal axis after refraction. a) parallel b) perpendicular c) inclined d) None of the above 19. The mid point of a lens is called ..... a) centre of curvature b) focus c) optic centre d) principal axis 20. The value of the focal length of a lens is equal to the value of the image distance when the rays are ........ a) passing through the optic centre b) parallel to the principal axis c) passing through the focus d) in all cases 21. The value of least distance of distinct vision is ...... a) 10 cm b) 15 cm c) 20 cm d) 25 cm 22. During refraction ...... will not change. a) wavelength b) frequency c) speed of light d) All the above 23. When objects at different distances are seen by the eye which of the following remain constant? a) focal length of eye-lens b) object distance from eye-lens c) the radii of curvature of eye-lens d) image distance from eye-lens 24. Near sightedness is called ..... a) Myopia b) Hypermetropia c) Presbyopia d) All the above 25. This colour of light has longest wavelength in the visible spectrum of light ...... a) orange b) red c) violet d) yellow 26. This is the coloured part we see in the eye....... a) pupil b) cornea c) eye-lens d) iris 27. If the power of the lens is 2D, then its focal length is ...... a) 100 cm b) 50 cm c) 25 cm d) 75 cm 28. On a hot day the sky appears ....... a) Red b) Yellow c) White d) Blue Answers : 1-c 2-a 29-b 4-c 5-b 6-b 7-d 8-c 9-c 10-c 11-d 12-c 13-a 14-d 15-b 16-c 17-b 18-a 19-c 20-d 21-d 22-b 23-d 24-a 25-b 26-d. 27-b 28-c. SET - II: 1. The scientist who introduced elliptical orbit ...... a) Bohr b) Zeeman c) Sommerfeld d) Schrodinger 2. If l = 1 for an atom, the number of orbitals in its sub-shell is ..... a) 1 b) 2 c) 3 d) 0 3. The reciprocal of resistivity is ...... a) conduction b) conductivity c) resistance d) potential difference 4. No two electrons will have all the four quantum numbers same. This is known as ...... a) Aufbau Principle b) Hund's rule c) Pauli exclusion principle d) Amper's rule 5. The relation between wavelength (λ) ..... frequency (υ) ...... and speed (c) is ...... a) c = υ λ b) υ = c λ c) λ =cυ d) c = υ+λ 6. The lowest energy state of the electron is known as ........ a) ground state b) unknown state c) excited state d) all the above 7. 'd' orbitals shape is .......... a) spherical b) dumb bell c) double dumb bell d) cylindrical 8. Electrons are assigned to orbitals in order of increasing value of .............. a) n b) l c) (n + l) d) nl 9. Which of the following is the most active metal? a) Lithium b) Sodium c) Potassium d) Rubidium 10. At the time of Robert Boyle number of elements known are ........ a) 63 b) 115 c) 91 d) 13 11. Eka-Aluminium was later found to be ..... a) Aluminium b) Scandium c) Germanium d) Gallium 12. Modern Periodic table has .......... a) 7 periods, 18 groups b) 18 periods, 7 groups c) 8 groups, 8 periods d) 18 periods, 8 groups 13. Both lanthanides and actinides are ....... a) d-block elements b) s-block elements c) f-block elements d) p-block elements 14. Given R1 = 100 Ω and R2 = 1 Ω the effective resistance when these are connected in parallel ........... a) 0.99 Ω b) 9.9 Ω c) 0.909 Ω d) 101 Ω 15. Group 14 (IV A) family is called ........... a) Oxygen family b) Nitrogen Family c) Carbon Family d) Boron family 17. Which of the following elements is electronegative? a) Sodium b) Oxygen c) Magnesium d) Calcium 18. No electron gain or loss from this atom .... a) Sulphur b) Hydrogen c) Neon d) Nitrogen 19. The coordination number of Na+ ion in NaCl is ............. a) 6 b) 8 c) 5 d) 3 20. Unit of specific resistance ....... a) ohm b) meter c) ohm-meter d) ohm/ meter 21. Joule / Coulomb is the same as ....... a) 1-watt b) 1-volt c) 1-ampere d) 1-ohm 22. 18th group elements are ....... a) Metals b) Non-metals c) Metalloids d) Gases Answers : 1-c 2-c 3-b 4-c 5-a 6-a 7-c 8-c 9-d 10-d 11-d 12-a 13-c 14-a 15-c 16-b 17-b 18-c 19-a 20-c 21-b 22-d. SET - III: 1. Which converts mechanical energy into electrical energy? a) Motor b) Battery c) Generator d) Switch 2. Scientist who discovered the Laws of electromagnetic induction? a) Maxwell b) Planck c) Newton d) Faraday 3. 1 Tesla = a) Weber / meter b) Weber / (meters)2 c) Weber.meter d) Weber.meter2 4. Magnetic field lines are ....... a) Real lines b) Imaginary lines c) Geometric lines d) Induction lines 5. Right hand rule is applicable to ...... charge only a) Positive b) Negative c) Neutral d) None 6. Hydrocarbons that contain -OH group are called a) Alkanes b) Esters c) Alcohols d) Aldehydes 7. This is used as 'lead' in pencil a) Carbon b) Graphite c) Lampblack d) Coke 8. The magnetic field lines in a solenoid are a) closed loops b) open loops c) mixed loops d) intersecting loops 9. The most abundant metal in the earth's crust is ...... a) Silver b) Aluminium c) Zinc d) Iron 10. The oil used in froth flotation process..... a) Kerosene oil b) Pine oil c) Coconut oil d) Olive oil 11. Thermite reaction is a ....... reaction. a) Endothermic b) Exothermic c) Reverse d) Physical 12. CaO + SiO2 → ............ a) CaSiO b) CaSi + O3 c) CaO3 + Si d) CaSiO3 13. Stainless steel is a mixture of a) Iron + Nickel + Chromium b) Iron + Carbon c) Iron + Carbon + Nickel d) Iron + Chromium 14. This is a method of improving the properties of a metal..... a) Refining b) Reduction c) Alloying d) Roasting 15. 24 Carat gold is very ....... a) hard b) brittle c) soft d) hard and brittle 16. Which of the following solution of acetic acid in water can be used as preservative? a) 5 -10% b) 10 -15% c) 15 - 20% d) 100% 17. The hardest material is known as a) Petroleum coke b) Diamond c) Wood charcol d) Buck minister fullerene Answers : 1-c 2-d 3-b 4-b 5-a 6-c 18-b 8-a 9-b 10-b 11-b 12-d 13-a 14-c 15-c 16-a 17-b.



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